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Finding the Fourth Proportional to 681.78, 1,020.42 and 616.08

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Solution

The fourth proportional to 681.78, 1,020.42 and 616.08 is: 922.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    681.78 : 1,020.42 = 616.08 : x
  2. Step 2: Convert to fraction form
    681.78/1,020.42 = 616.08/x
  3. Step 3: Cross multiply
    681.78x = 1,020.42 × 616.08
  4. Step 4: Simplify right side
    681.78x = 628,660.35
  5. Step 5: Solve for x
    x = 628,660.35/681.78
  6. Step 6: Final answer
    x = 922.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.